Maybe making it so that you could use resistance card on it works. Then, making traps hurt more if you are wearing deviling. Fire Armor is not a reliable solution since the damage output of water elements skyrockets. Especially since there is a card called Ktullanux card which increases damage to Fire Elements by 50%. If resistance card works you could get rid of the fire element and focus on resisting fire elements instead. Which will still make it balanced since you will be forced to get rid of your deviling card. Just a suggestion. I hate the idea of using fire element armor if you see a trapper since you could reach damage that is too much.
